Melania Trump met Prince Harry for the first time over the weekend while attending the Invictus Games in Toronto, Canada, but one bizarre moment between the two stood out: a hand "signal" seen around the world.

The first lady posed for pictures with his royal highness at the event, of which Twitter conspiracy theorists quickly analyzed after noticing something up with Prince Harry's hand -- a sign of the horns.

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Melania Trump at the Invictus Games

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Melania Trump at the Invictus Games

TORONTO, ON - SEPTEMBER 23: Prince Harry meets U.S. first lady Melania Trump for the first time as she leads the USA team delegation ahead of the Invictus Games 2017 on September 23, 2017 in Toronto, Canada (Photo by Chris Jackson/Getty Images for the Invictus Games Foundation )

TORONTO, ON - SEPTEMBER 23: Prince Harry meets with U.S. first lady Melania Trump for the first time as she leads the USA team delegation ahead of the Invictus Games 2017 on September 23, 2017 in Toronto, Canada (Photo by Chris Jackson/Getty Images for the Invictus Games Foundation )

TORONTO, ON - SEPTEMBER 23: Prince Harry meets with U.S. first lady Melania Trump for the first time as she leads the USA team delegation ahead of the Invictus Games 2017 on September 23, 2017 in Toronto, Canada (Photo by Chris Jackson/Getty Images for the Invictus Games Foundation )

TORONTO, ON - SEPTEMBER 23: Prince Harry meets with U.S. first lady Melania Trump for the first time as she leads the USA team delegation ahead of the Invictus Games 2017 on September 23, 2017 in Toronto, Canada (Photo by Chris Jackson/Getty Images for the Invictus Games Foundation )

TORONTO, ON - SEPTEMBER 23: Prince Harry meets with U.S. first lady Melania Trump for the first time as she leads the USA team delegation ahead of the Invictus Games 2017 on September 23, 2017 in Toronto, Canada (Photo by Chris Jackson/Getty Images for the Invictus Games Foundation )

TORONTO, ON - SEPTEMBER 23: Prince Harry meets with U.S. first lady Melania Trump for the first time as she leads the USA team delegation ahead of the Invictus Games 2017 on September 23, 2017 in Toronto, Canada (Photo by Chris Jackson/Getty Images for the Invictus Games Foundation )

TORONTO, ON - SEPTEMBER 23: U.S. first lady Melania Trump smiles as she meets with Prince Harry for the first time while leading the USA team delegation ahead of the Invictus Games 2017 on September 23, 2017 in Toronto, Canada (Photo by Chris Jackson/Getty Images for the Invictus Games Foundation )

TORONTO, ON - SEPTEMBER 23: (NO UK SALES FOR 28 DAYS) Prince Harry meets Melania Trump on day 1 of the Invictus Games Toronto 2017 on September 23, 2017 in Tornonto, Canada. The Games use the power of sport to inspire recovery, support rehabilitation and generate a wider understanding and respect for the Armed Forces. (Photo by Pool/Samir Hussein/WireImage)

TORONTO, ON - SEPTEMBER 23: (NO UK SALES FOR 28 DAYS) Prince Harry meets Melania Trump on day 1 of the Invictus Games Toronto 2017 on September 23, 2017 in Tornonto, Canada. The Games use the power of sport to inspire recovery, support rehabilitation and generate a wider understanding and respect for the Armed Forces. (Photo by Pool/Samir Hussein/WireImage)

TORONTO, ON - SEPTEMBER 23: (NO UK SALES FOR 28 DAYS) Prince Harry meets Melania Trump on day 1 of the Invictus Games Toronto 2017 on September 23, 2017 in Tornonto, Canada. The Games use the power of sport to inspire recovery, support rehabilitation and generate a wider understanding and respect for the Armed Forces. (Photo by Pool/Samir Hussein/WireImage)

TORONTO, ON - SEPTEMBER 23: (NO UK SALES FOR 28 DAYS) Prince Harry meets Melania Trump on day 1 of the Invictus Games Toronto 2017 on September 23, 2017 in Tornonto, Canada. The Games use the power of sport to inspire recovery, support rehabilitation and generate a wider understanding and respect for the Armed Forces. (Photo by Pool/Samir Hussein/WireImage)

TORONTO, ON - SEPTEMBER 23: (NO UK SALES FOR 28 DAYS) Melania Trump meets Prince Harry on day 1 of the Invictus Games Toronto 2017 on September 23, 2017 in Tornonto, Canada. The Games use the power of sport to inspire recovery, support rehabilitation and generate a wider understanding and respect for the Armed Forces. (Photo by Pool/Samir Hussein/WireImage)

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In photos of the two from the event, people are saying the British royal made a devil sign with his hands.

Prince Harry meeting FLOTUS and making devil hand sign. Is that a Hi Donald, or I'm Here So I Won't Get Fined? pic.twitter.com/BN61WH3dGx

What's Harry doing with fingers? 1in each hole or signalling he thinks Melania is the devil? Or is there a rock tra… https://t.co/NcF5B5U3Ru

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Over the years the hand symbol has become more diluted as its usage has morphed into the mainstream, such as in rock concerts -- it was famously used by the late Black Sabbath singer, Ronnie James Dio, who began making the hand-horns on stage circa 1979.